Abstract

Zinc (Zn), boron (B) and molybdenum (Mo) are essential to increase the productivity of mungbean (Vigna radiata L.) and help to maintain the soil fertility but mostly ignored. Hence, an experiment was conducted during the years of 2016 and 2017 to know the impact of Zn, B and Mo on mungbean yield, nutrient uptake, economics and soil fertility improvement. The experiments were planned in randomized complete block design including of eight treatments with three replications. The treatments were T₁ = Control, T₂ = Zn 2 kg ha^-1, T₃ = B 1.5 kg ha^-1, T₄ = Mo 1 kg ha^-1, T₅ = Zn₂B_1.5, T₆ = Zn₂Mo₁, T₇ = B_1.5Mo₁ and T₈ = Zn₂B_1.5Mo₁. The other fertilizers, N, P, K and S at 20, 20, 30 and 10 kg ha^-1, respectively were used in all treatments. The results indicate that the highest seed yield (1522 kg ha^-1) was obtained from T₈ treatment followed by T₇. The highest percent seed yield increment (51.6%) over control was achieved in T₈ treatment. Most of the growth and yield contributing characters of mungbean were recorded highest in T₈ treatment. The maximum nodulation (37.6) and highest amount of protein (24.3%) was also obtained from T₈ treatment. The T₈ treatment contributed positively to attain higher total uptake of N, P, K, S, Zn and B by mungbean. The combination of Zn, B and Mo is showed more productive compare to sole or couple use of these micronutrients. The T₈ (Zn₂B_1.5Mo₁ kg ha^-1) treatment exhibited helpful effects on soil organic matter, total N, available P, Zn and B. This treatment also showed economically better on the basis of net return. Results of the present study suggest that the combination of Zn, B and Mo applied at 2, 1.5 and 1 kg ha^-1, respectively could be recommended for mungbean cultivation.

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